To distribute tasks in the Shared WorkSpace your MindView file must be saved in the Shared WorkSpace.
In your MindView file, you need to add resources to your branches and those resource must have a valid email address. This email address should be the same email address that the user uses to access their Shared WorkSpace account.
You can then simply choose to navigate to the Share tab and select Distribute Tasks to Resources:
Once the tasks have been distributed, these tasks will appear in the Shared WorkSpace under the Tasks tab.